Deflection acquisition and transverse distribution influence line calculation method and system based on three-dimensional scanning

The invention discloses a deflection acquisition and transverse distribution influence line calculation method and system based on three-dimensional scanning. The method comprises the following steps of: acquiring initial point cloud coordinates of three-dimensional laser scanning when the deflection of a bridge does not change; obtaining deformed point cloud coordinates of three-dimensional laser scanning when the deflection of the bridge changes; extracting a first bridge floor fitting function of a measured section according to the initial point cloud coordinates; extracting bridge floor discrete points of the measured section according to the deformed point cloud coordinates; selecting deformation corresponding points of the measured section according to the bridge floor discrete points; extracting a second bridge floor fitting function of the measured section according to the deformation corresponding points; calculating a bridge deflection function according to the first bridge floor fitting function an